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b) 6m²n + 3mn - 9mn² = 3mn (2m + 1 - 3n)
c) 5abc - 10b - 15bc = 5 (abc - 2b - 3bc)
d) 16x^10 - 9x^6 = (4x^5 - 3x³) (4x^5 + 3x³)
= x³ (4x² - 3) x³ (4x² + 3)
= x^6 (4x² - 3) (4x² + 3)